2002 Jaguar X-Type 3.0L Sedan 4D buying this car with 78,000 on it? from dealer what concerns should i worry about , its 8400 price. what is the est life of engine?

First of all when you are looking at buying a used car, see if you can have a certified technician look at it (someone from a different dealership) before you buy. Things to look at for sure:

1. Prop shaft (as indicated in solution #1). Once you get up over 50K miles it tends to whine, definitely in colder climates.
2. Hoses. The X-type is known to spit out "Evap Leak" codes (check engine light will come on intermittently). Remove the plastic cover from the engine block and check the hoses there for cracks and splits. The hoses get hot when the engine is running and cool down when the engine is turned off. It makes the hoses brittle and causes cracks/splitting, etc.
3. Have the transmission checked. This car has a "lubed for life" system on a lot of the parts, including the tranny.
4. Have the transfer case checked. This controls your AWD and is known to start to fail after the 60K mile mark. (most dealerships will tell you the x-type needs its auto tranny replaced every 3-5 years!)

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BelgianAlien.

Not to scare you.. but transmission issues, whining issues related to prop shaft and others have been experienced.. see jaguarforums.com for more.. ive learned a lot from them.. its a great car but needs a lot of attention in order to keep it going once it gets to that "high" mileage point.. mine is now 125K